02/06/84  cross_ring_io_


Entry points in cross_ring_io_:
   (List is generated by the help command)


:Entry:  allow_cross:  02/06/84 cross_ring_io_$allow_cross


Function: This entry point must be called to allow use of an I/O
switch via cross-ring attachments from an outer ring.  The call must
be made in the inner ring before the outer ring attempts to attach.


Syntax:
declare cross_ring_io_$allow_cross entry (char(*), fixed bin,
     fixed bin(35));
call cross_ring_io_$allow_cross (switch_name, ring, code);


Arguments:
switch_name
   is the inner ring switch name.  (Input)
ring
   is the highest validation level from which switch_name may be used.
   (Input)
code
   is a standard status code.  (Output)


Notes:  This entry may be called more than once with the same
switch_name argument.  Subsequent calls are ignored.


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Historical Background

This edition of the Multics software materials and documentation is provided and donated
to Massachusetts Institute of Technology by Group BULL including BULL HN Information Systems Inc. 
as a contribution to computer science knowledge.  
This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology,
Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell BULL Inc., Groupe BULL
and BULL HN Information Systems Inc. to the development of this operating system. 
Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970),
renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership
of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture 
for managing computer hardware properly and for executing programs. Many subsequent operating systems 
incorporated Multics principles.
Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., 
as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. .

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Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without
fee is hereby granted,provided that the below copyright notice and historical background appear in all copies
and that both the copyright notice and historical background and this permission notice appear in supporting
documentation, and that the names of MIT, HIS, BULL or BULL HN not be used in advertising or publicity pertaining
to distribution of the programs without specific prior written permission.
    Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc.
    Copyright 2006 by BULL HN Information Systems Inc.
    Copyright 2006 by Bull SAS
    All Rights Reserved